Cylindrical lock set

ABSTRACT

A cylindrical lock set including an operating unit having a cylindrical housing containing a unitary retractor frame of nonmetallic, low-friction material supporting a unitary metallic retractor slide. A latch unit releasably connected to the operating unit includes a case supporting a latch bolt releasably connected to the retractor slide by a female tailpiece. Coengageable cam surfaces on the tailpiece and on a deadlocking member carried by the latch bolt positively drive the deadlocking member to a deadlocking position relative to the case if an attempt is made to forcibly depress the latch bolt as by insertion of a tool between the outer edge of an associated door and strike plate. The operating unit also includes a locking mechanism for locking a rollback against rotation relative to the housing.

United States Patent 691 Him ,81 ,21

Hart et al. June 25, 1974 1 CYLlNDRlCAL LOCK SET 4 3,279,836 l0/l966 Swanson .L 292/l69.13 r 3,287,046 ll 1966 R ll 292 169.22 [75] Inventors: Le Roy west Hartford; 3,459,448 851969 11:22:11 :1 292/169 x Thomas R. Salonia, Kensington, both of C a Bergen Primary Examiner-Joseph H. McGlynn v Yorba cahf' Assistant Examiner-Richard P. Tremblay [73] Assignee: Emhart Corporation, Bloomfield, Attorney, Agent, Firm-McCormick, Paulding &

Conn. Huber [21] Appl. No.: 292,346 1 A cylindrical lock setincluding an operating unit having a cylindrical housing containing a unitary retractor [52 us. Cl... 292/169.13, 292/169.14 292/169.22 fram? material .PPOrting 292/1310. 70/151 a unitary metallic retractor slide. A latch unit releas- 511 Int. Cl. E05b 55/00 isosc 1/12 ably Perating unit includes a case [58 Field Of Search 292/169 169 13 16914 suppmmgalatch releasablymnnected the 292 [1691 5 69.22 DIG 163 -i T tractor slide by a female tailpiece. Coengageable cam 15 surfaces on the tailpiece and on a deadlocking member carried by the latch bolt positively drive the deadlocking member to a deadlocking position relative to [56] References Cited the case if an attempt 15 made to forcibly depress the UNITED STATES PATENTS latch bolt as by insertion of a tool between the outer 2,293,856 8/1942 Schlage 70/146 edge of an associated door and strike plate The pe 2,730,391 l/l956 Rayburn 292/l69.l3 ating unit also'includes a locking mechanism for ]Ock 2,733,088 l/l956 Fisler et al. 292/169al4 X 2,804,327 8/1957 2,930,646 3/1960 ing a rollback against rotation relative to the housing.

33 Claims, 11 Drawing Figures PATENTED JIIIIZ 5 I974 SHEET 3 [IF 3 0 6 ZB W 5 Q I TI fl \A m 2 W 2W M W B 2 5 M I WIN m I I 0 FIG. IO

FIG. 9

FIG. II

CYLINDRICAL LOCK SET BACKGROUNDOF THE INVENTION This invention relates in general to lock sets and deals more particularly with lock sets of cylindrical type which comprise two separate units which include an operating unitand a bolt unit adapted for assembly in intersecting bores formed in a door.

The general purpose of the present invention is to provide novel and improved construction for lock sets of the aforedescribed type to facilitate economical manufacture of parts and assembly thereof. A further aim of the invention is to provide improved means for supporting the retractor slide relative to independently operable rollbacks in a lock set of the aforedescribed type for improved operation thereof.

SUMMARY OF THE INVENTION The latch unit includes a unitary female tailpiece having a substantially uniform thickness throughout its length and cam surfaces thereon which cooperate with cam surfaces on a deadlocking member carried by the latch bolt to positively move the latter member between deadlocking and non-deadlocking positions realtive to the latch bolt case. The retractor frame is constructed and arranged to cooperate with the housing to facilitate assembly of the operating unit.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a plan view in central horizontal section illustrating a cylindrical lock set embodying the present invention, parts of theoperating unit being shown in full and the locking mechanism thereof being shown in locked condition.

FIG. 2 is a fragmentary sectional view taken along the line 2-2 of FIG. 1.

FIG. 3 is a fragmentary plan view of the operating unit of FIG. 1.

FIG. 4 is an end elevational view of the lock set of FIG. 1 showing the operating unit with the cover re moved therefrom and showing the bolt unit with parts thereof in vertical central section.

FIG. 5 is a fragmentary sectional view taken generally along the line 5-5 of FIG. 4.

FIG. 6 is a fragmentary sectional view taken along the line 6-6 of FIG. 5.

FIG. 7 is a fragmentary plan view of the latch unit of FIG. 1 in central horizontal section, and illustrating the condition of the latch mechanism when the door is closed.

FIG. 8 is a fragmentary sectional plan view of the latch unit similar to FIG. 7 but illustrates operation of the dead-locking member when an attempt is made to forcibly depress the latch bolt. 1

FIG. 9 is a sectional view taken along the line 9--9 of FIG. 4, but shows the position of the deadlocking 2 r member when the door is closed as illustrated in FIG. 7.

FIG. 10 is similar to FIG. 9, but shows the deadlocking member in its deadlocking position as when the parts of the latch mechanism are in the positions in which they appear in FIG. 8.

FIG. 11 is a fragmentary sectional view similar to FIG. 4, but shows another embodiment of the invention.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS In the drawings and description which follow, the present invention is illustrated with reference to a cylindrical lock set having an entrance function, however, it should be understood that the lock set of the present invention is adapted for modification to perform a variety of desired locking functions by addition or substitution of parts in the mechanism thereof and may also be adapted to function as a latch set.

Referring now to the drawings and particularly to FIGS. l-4, a cylindrical lock set embodying the present invention and indicated generally by the reference numeral 10, includes an operating unit and a latch unit respectively generally indicated at 12 and 14 disposable in operative relationship with a door (not shown). The operating unit has a generally cylindrical housing 16 for location in a bore which extends transversely through a door, whereas the latch bolt unit includes a cylindrical case 18 for positioning in a longitudinal bore in the outer edge of the door which intersects the transverse bore therein. Projecting from the forward end of the latch unit case 18 is a latch bolt 20 operatively connected at its rear end to the operating unit 12, as will be further described.

Considering first the operating unit 12 in further detail, the cylindrical housing 16 is cup-shaped, preferably formed from sheet metal, and has an annular wall 22 and an integral bottom or outer end wall 24. A tubular outer sleeve 26 is rigidly mounted on the outer end wall 24, extends outwardly therefrom, and has an axially extending locking slot 28 therein which opens inwardly to communicate with a rearwardly extending slot 30 formed in the wall 24, as shown in FIG. 1. A tubular inner sleeve 32 is rigidly secured to a cover plate 34 which fits within the open end of the housing 16 and forms the inner end wall thereof. The .cover plate is provided with diametrically opposed outwardly extending projections 36, 36 which fit into notches 38, 38 in the armular wall 22. The latter wall has another inwardly opening notch 40 at the forward end thereof to facilitate interconnection of the housing 16 and the bolt unit case 18 as will hereinafter be further described. The sleeves 26 and 32 respectively, project beyond the interior and exterior surfaces of a door with which the lock set 10 is associated and decorative rosette plates (not shown) are engaged upon the exterior threads thereon to retain the housing 16 within the transverse opening in the door.

Within the housing, there is provided a unitary retractor frame 42 made from non-metallic, low-friction material supporting a retractor slide 44 for longitudinal reciprocal movement forwardly and rearwardly of the housing or generally toward and away from the latch unit 14. The frame 42 is preferably molded from Delrin type 500-NC or an equivalent plastic material, and engages the annular wall 22 to generally complement the 3 interior of the housing 16, and has inner and outer end walls respectively indicated at 46 and 48 transversely connected by an arcuate rear wall 50 and longitudinally extending upper and lower walls 52 and 54. Projections 55, 55 extend radially outwardly from diametrically opposite sides of the inner end wall 46 and are received in the notches 38, 38 in the annular wall of the housing 16 to retain the retractor frame 42 in fixed position in the housing. The upper and lower walls 52 and 54 cooperate with the rear wall 50 to define a generally U- shaped forwardly opening recess or slideway which also opens through the inner wall 46 and receives the retractor 44. More specifically, the retractor slide 44 is received in a slideway defined by a pair of substantially identical parallel grooves or tracks respectively formed in the upper and lower walls 52 and S4. The lower track is defined by an upwardly facing slide surface 57 and laterally inwardly facing slide surfaces 58, 58, as best shown in FIG. 5. The upper track is similarly defined by a downwardly facing slide surface 57 and laterally inwardly facing slide surfaces 58, 58. A generally cylindrical spring retaining recess 60 opens centrally through the'rear wall 50.

The projections 36, 36 on the cover plate 34 which are received within the notches 38, 38 overlie the corresponding frame projections 55, 55. The cover plate 34 is secured to the housing by screws 62, 62 which extend through the cover plate and the retractor frame 42 proximate the projections thereon and through housing outer wall 24 to threadably engage end portions of a generally U-shaped retainer or yoke 64 which partially surrounds the outer sleeve 26 and is of somewhat greater thickness than the material of the housing.

The retractor slide 44 is preferably made from infiltrated steel and includes upper and lower slide shoes 66, 66 respectively received in and complementing the upper and lower tracks and connected by a relatively thin vertically disposed central web 68. The lower slide shoes 66 include a downwardly facing bearing surface 70 in sliding engagement with the slide surface 57 and laterally outwardly facing bearing surfaces 58, 58. The upper slide shoe is similarly arranged within the upper slide track. At this point, itshould be noted'that the slide tracks are relatively wide and occupy a substantial portion of the width of the retractor frame. In the illustrated lock set 10, each of the slide tracks has a width greater than one half the width of the retractor frame 42 as will be evident from FIG. 5. The central web 68 includes a longitudinally disposed male connecting portion 74 which extends forwardly beyond the slide shoes and has an enlarged generally rectangular head 76 at the forward extremity thereof for connection with the latch unit 14 as will be hereinafter further described. The web 68 also has a central spring retaining seat 78 at the rear thereof. Upper and lower shoulders 80, 80 project laterally outwardly from the central web 68 on opposite sides thereof and have upper and lower forwardly facing cam faces thereon respectively indicated at 82, 82. Each cam face is inclined in a rearwardly and outwardly direction from the central portion of the retractor. The web 68 also has a longitudinally extending locking bar slot 84 formed therein which will be hereinafter further discussed. A compression spring 86 which has one end thereof engaged with the spring retaining seat 78 and the other end thereof received within the spring retaining recess 60 and in engagement with the annular wall 22 biases the retractor 44 toward the forward end of the housing to a projected position corresponding to a projected position of the bolt 20. When the retractor is in the latter position, the enlarged head 76 is exposed at the. forward end of the housing 16 for connection with the latch bolt unit 14.

A pair of elongated tubular spindles or rollbacks 88 and 89 are respectively received in the inner and outer sleeves on the housing 16 for operating the retractor 44. The inner rollback 88 is rotatably supported in the inner sleeve 32 and extends into the housing 16 laterally of the retractor slide 44. The rollback 88 has a pair of angularly spaced and rotationally facing cam surfaces 90, 90 on one end thereof for respectively engaging the cam faces 82, 82 on the inner side of the retractor 44. Movement of the inner rollback 88 out of the housing 16 is limited by engagement between the inner surface of the sleeve 32 and three angularly spaced stops 92, 92 and 94 formed on the rollback. The three stops or points of contact between the rollback and the inner end of itssupporting sleeve assures coaxial alignment between the rollback and sleeve. The angular arrangement of the .stops on the rollback also assures proper alignment and contact between the retractor cam faces 82, 82 and the cam surfaces 90, 90 on the rollback 88. Rotation of the inner rollback 88 in one direction engages one rollback cam surface 90 with an associated retractor cam face 82 to move the retractor slide rearwardly and rotation of the inner rollback 88 in the opposite direction causes the other cam surface 90 on the rollback to engage the other cam face 82 on the retractor slide to also move the slide 44 rearwardly. Thus, rotation in either direction of the inner rollback 88 moves the retractor slide 44 rearwardly or to a retracted position corresponding to a retracted position of the latch bolt 20. The construction and arrangement of the retractor slide 44 permits each rollback cam surface 90 to engage an associated cam face 82 on the retractor slide a substantial distance laterally inwardly beyond an associated slide surface 58. More specifically, each rollback cam surface 90 engages an associated cam face 82 along a line of contact which extends both laterally inwardly and outwardly a substantial distance beyond an associated slide surface 58 on the retractor frame. This arrangement assures smooth operation of the latch bolt retracting mechanism of substantially eliminating any tendency of the retractor slide to twist or deviate from its longitudinal path in response to pressure applied on one side of the longitudinal centerline thereof by operation of one of the rollbacks.

The outer rollback 89 is similar in most respects to the inner one and is rotatably received within the outer sleeve 26. However, the outer rollback has an axially extending locking slot 91 therein which opens through the inner end thereof. Movement of the outer rollback out of the housing 16 is limited by engagement between the inner surface of the sleeve 26 and three stops provided on the outer rollback 89 so that cam faces 90, 90' on the outer rollback are properly aligned with cam faces 82, 82 on the outer side of retractor slide.

A pair of door knobs such as indicated at 96 and 97 are slidable over the projecting ends of the inner and outer rollbacks 88 and 89 and are keyed thereto by inner and outer knob catches 98, 98. A typical knob catch 98, shown in FIG. 1, comprises an arcuate spring member mounted within the hollow interior of an associated rollback to outwardly spring against and tightly engage the interior surface of the rollback. The latter spring member carries a button which protrudes through a suitable opening in the wall of its respective rollback to constrain the knob catch against movement relative to the rollback and also to engage the usual tubular shank of an associated door knob. The spring-like nature of each knob catch pennits the button thereof to be depressed until the door knob is moved into position for seating of the button within an opening in the shank of the knob.

An operating unit constructed and arranged as hereinbefore described when connected to a conventional latch unit constitutes alatch set having a passageway function, that is, it may be used on a passageway door where no locking function is required. However, to permit the illustrated lock set to be locked from the interior side of a door, a locking mechanism 100 is provided to prevent relative rotation between the outer rollback 89 and the outer sleeve 26.

The locking mechanism 100 includes an elongated transversely extending locking bar 102 which is substantially flat in cross section, that is, its width is much greater than its thickness. The locking bar 102 extends through the slot 84 in the retractor slide and is'slidably supported in the hollow interior of the inner rollback 88 by a locking bar guide 104 which includes a pair of substantially circular end sections 106 and 108 having axially aligned openings therethrough in which the locking bar 102 is slidably received. The end section 106 has a lug 109 thereon which is received in an axial slot in the inner rollback 88 and engages the end wall of the slot to restrain the bar guide 104 against axial movement in one direction. The knob catch 98 in the inner rollback is positioned adjacent the end section 106 and restrains the locking bar guide against axial movement in the other direction relative to the inner rollback.

The inner extremity of the locking bar 102 is received within a central aperture of a turn button washer 110 secured to a turn button 111, the inner extremity of the locking bar having a bent tab 112 which retains the washer and turn button thereon. The turn button is mounted within the hollow interior of the outer end of the inner rollback 88 and projects through a central aperture in the inner knob 96. The turn button washer 110 has a radial lug 114 which extends radially outwardly beyond the peripheral surface of the turn button for engagement in a detent slot 116 in the inner rollback 88. The detent slot 116 has an axially extending portion which communicates with a circumferentially oriented locking portion to permit the turn button 111 to be depressed and turned to engage the lug 1 14 in the locking portion of the detent slot 116, as well known in the art. A compression spring 118 surrounds the look ing bar and bears against the turn button disc 110 and the locking bar guide 104. Thus, inward movement or depression of the turn button 111 moves the locking bar inwardly against the bias of the spring 118 and release of the turn button 111 permits the locking bar 102 to move outwardly, unless it is constrained against such movement by engagement of the lug 1l4within the locking portion of the detent slot 116.

A substantially rectangular locking bar dog 120 which has a locking tab 121 is mounted on the outer end portion of the locking bar 102. The dog 120 has a slot therein which receives the end portion of the locking bar therethrough. Axial inward movement of r the 6 1 dog is limited by a pair of lugs 122, 122 integral with and extending from the shank of the locking bar 102 near the outer end thereof. A compression spring 124 mounted on the outer extremity of the locking bar 102 and retained thereon by undercut spring seats formed near the terminal end thereof bears upon the dog 120 and urges it toward the lugs 122, 122..

The locking tab 121 is slidably received within the axially extending slots 91 and 28 respectively formed in the outer rollback 89 and the outer sleeve 26. The slots 91 and 28 are normally in alignment with each other and move out of alignment when the exterior rollback is rotated in one or the other direction to operate the latch bolt 20. t

In the unlocked or released position of the dog 120, as shown in broken lines in FIG. 1, the locking tab 121 thereof does not interfere with relative rotation between the outer rollback 89 and the outer sleeve 26, but when the locking bar 102 is moved to its locking position, indicated by full lines, the locking tab 121 is disposed within the slots 91 and 28 to prevent rotation of the outer rollback 89 and thereby locking the outer knob 97. However, the inner rollback is free to rotate and may be rotated with the inner knob 96 to open the door when the outer knob is locked.

It will be apparent that the locking bar 102 is capable of movement independently of the locking dog 120. Thus, if for any reason, the locking slots 91 and 28 are slightly misaligned, such misalignment will not prevent normal operation or movement of the turn button 111 to its depressed and locked position. Thus, if the locking dog 120 is prevented from entering the slots 91 and 28 because of slight misalignment therebetween, it will assume a slightly tilted or inclined position relative to the locking bar as the bar is moved to its locked position. Thereafter, any slight movement of the outer knob 97 which causes alignment of the slots 91 and 28 pemlits the locking dog 120 to enter the slots under the biasing force of the spring 124.

The lock set 10 also includes mechanism to permit operation from the exterior or outer side when the associated door is closed and the locking bar mechanism is in its locked position. Such unlocking mechanism includes an elongated tubular auxiliary rollback 126 rotatably received within the hollowinterior of the outer rollback 89. The auxiliary rollback, best illustrated in FIG. 1, has rotationally facing cam surfaces on the inner extremity thereof for engaging the cam 82, 82 on the outer side of the retractor slide in the manner substantially aforedescribed with reference to the inner rollback 88. At its outer extremity, the auxiliary rollback has a slot 128 for receiving the tail of a lock cylinder (not shown) mounted in the outer knob 97, as well known in the art. Operation of the lock cylinder in either direction rotates the auxiliary rollback 126 to operate the retractor slide and retract the latch bolt 20. The auxiliary rollback 126 is arranged to operate independently of the outer rollback 89 so that the auxiliary rollback may be operated by the lock cylinder to re tract the latch bolt when the outer rollback is constrained against rotation by the locking mechanism 100.

In assembling the unit 12, two sub-assemblies are preferably made and joined to complete the final assembly of the unit. More specifically, one sub-assembly is made which comprises the cup-shaped housing part and its associated outer sleeve 26, the outer rollback back 126. A knob catch 98 is preferably first assembled in the outer rollback 89 after which the knob catch button is depressed and the outer rollback 89 is inserted into the sleeve 26 through the inner end thereof. The auxiliary rollback 126 may then be inserted in the outer rollback to complete the sub-assembly.

In a like manner, another sub-assembly is fonned which includes the cover 34 and the inner sleeve 32, the locking mechanism 100, the retractor slide 44 and the retractor frame 42. In making this sub-assembly, the locking bar guide 104 is first inserted in the inner rollback 88 after which a knob catch 98 is assembled therewith. The inner rollback 88 is then inserted into the sleeve 32 in the manner aforedescribed. The locking bar 102 with the turn button 1 1 1 and the spring 1 18 positioned thereon is inserted through the outer end of the inner rollback and through the locking bar guide 104. The dog end of the locking bar 102 is inserted through the slot 84 in the retractor slide after which the locking dog 120 and the spring 124 are positioned on the extremity thereof. When the retractor slide 44 is inserted into the slideway in the retractor frame 42 through the forward open end thereof, the subassembly is complete.

Assembly of the operating unit 12 is completed by slidably inserting the retractor frame into the open end of the cup-shaped housing part. It will be noted that the locking tab 121 on the locking dog 120 will pass freely through the opening 30 in the housing inner wall 24 which permits the frame 42 to slide coaxially into the cup-shaped housing without interference. When the frame 42 is partially inserted into the housing, the spring 86 may be inserted inwardly through the recess 60 in the frame rear wall 50. When the inner end of the spring is seated on the retractor, force may be applied to the outer end thereof to compress the spring whereby to permit the frame to be fully seated within the housing 16. After the frame and cover are seated, the screws 62, 62 are inserted and engaged with the yoke 64 to complete the operating unit assembly.

Referring now to FIG. 1, it is noted that when the frame 42 is positioned within the housing, a portion of the frame outer wall 48 overlies an associated portion of the opening 30 to define an outwardly facing abutment surface 129 at the inner end of the opening 30 for engagement with the locking dog 120 in its unlocked position to prevent the locking dog from entering the interior of the housing 16. When the locking mechanism 100 is in its unlocked position, the locking dog 120 preferably engages the abutment 129 to apply a slight biasing force to the spring 124 and thereby absorb any slack or tolerance in the various parts which comprise the locking mechanism.

' Considering now the latch unit 14, and referring particularly to FIGS. 1, 4 and 7, the case 18 has a generally cylindrical tubular configuration and is closed at its rear end by a cap 127 and at its front end by a conventional faceplate 130 provided with mounting holes (not shown). The cap 127 has fingers 132, 132 which extend rearwardly therefrom for engagement with the housing 16 within the notch 40 to releasably retain the bolt unit in connected engagement with the operating unit, as shown in FIG. 1.

The latch bolt has a generally cylindrical shape, is slidably mounted in the case 18, and extends through a complementary opening in the faceplate 130. The

latch bolt is beveled at its outer end and has a flat side 134 which extends longitudinally thereof for a portion of its length and terminates at a shoulder 136 (FIG. 4) which engages the inner side of the faceplate to limit movement of the latch bolt to its fully projected position, as it appears in FIGS. 1, 4 and 7. The beveled end of the latch bolt provides a cam surface for engagement with a conventional strike such as indicated at 138 mounted on a door frame (not shown) to cause movement of the latch bolt to its retracted position as the door is closed.

A transversely extending slot 140 is formed in the inner end of the latch bolt 20 to accommodate parts of a deadlocking mechanism to be hereinafter described. The latch bolt 20 also has a longitudinally extending hole in the portion thereof rearwardly of the shoulder 136 which slidably receives an auxiliary bolt 142 of conventional type disposed adjacent flat side of the latch bolt and which extends through a complementary hole in the face plate 130. The inner end portion of the auxiliary bolt is enlarged and provided with a longitudinally disposed flat side or blocking surface 144. The latch bolt is urged to its projected position by a compression spring 146 which surrounds a guide pin mounted on a stabilizing washer 148 disposed in the rear of the case adjacent the cap 127 and acts between the stabilizing washer and the latch bolt.

The auxiliary bolt 142 is biased to its projected or full-line position, as it appears in FIGS. 1 and 4, by another compression spring 150 maintained in position by another guide pin mounted on the stabilizing washer 148 and projecting forwardly therefrom into a spring receiving recess in the rear of the auxiliary bolt.

The latch bolt 20 is connected to the retractor 44 by a female connecting member or tailpiece 152. The tailpiece is unitary or formed from a single piece of material and is adapted to be cut and formed from flat metal and has a substantially uniform thickness throughout its length. The lateral thickness of the tailpiece 152 is less than the lateral width of the enlarged head 76 on the retractor slide 44, as best shown in FIG. 1, to permit a degree of lateral adjustment therebetween when the lock set 10 is assembled with a door. The forward end of the tailpiece is received in a rearwardly opening recess in the latch bolt and is connected thereto by a pin 156 which extends transversely of the latter recess and through an elongated slot 158 in the tailpiece, thus providing a lost motion connection which permits depression of the latch bolt from its projected position independently of the tailpiece, for a purpose to be hereinafter described.

The tailpiece 152 also includes a pair of spaced apart legs 160, 160 the rear end portions of which project through openings in the cap 127 and best shown in FIG. 1. Each leg 160 has at least one transversely inwardly projecting lug 162 thereon for engagement with the retractor slide head 76 to provide operable connection therewith. The illustrated bolt unit 10 has a tailpiece wherein each leg 160 is provided with a single lug 162 which engages the retractor 44 rearwardly of the head 76 thereof to provide drive connection between the retractor slide and the tailpiece whereby the tailpiece moves with the retractor slide 44, when the slide moves to its retracted position. However, it is noted that the tailpiece 152 is free to move rearwardly with the latch bolt 20 and independently of the retractor slide 44. A light compression spring 164 disposed between the legs 160, 160 and retained at its rear end by tabs 166, 166 struck from the stabilizing washer 148 engages the tailpiece 152 to urge it forwardly to its normal position wherein the lugs 162, 162 engage the head 76 of the retractor slide 44. In aforesaid position, the pin 156 is dis posed at the forward end of the slot 158 as shown in FIGS. 1, 4 and 7.

The side of the tailpiece 152 opposite the auxiliary bolt. 142 has a cam recess 168 therein longitudinally aligned with the slot 158 and spaced rearwardly thereof. A generally complementary ramp or camming and blocking lug 170 formed by a laterally offset portion of the tailpiece opposite the cam recess has camming and blocking surfaces thereon.

The slot 140 in the latch boltjdefines a guideway which extends transversely of the tailpiece 152 and in which a substantially flat deadlocking plate 171 is disposed for rectilinear sliding movement transversely of the latch bolt. The deadlocking plate has a notch formed therein on the auxiliary bolt side thereof to define a pair of fingers 172, 172 which straddle the auxiliary bolt 142, and which are best shown in FIGS. 9 and 10.

A clearance opening 174 is formed intermediately at the ends of the deadlocking plate through which the tailpiece 152 extends, and a finger 176 projects into the latter opening from the central portion of the side thereof adjacent the recessed side of the tailpiece 152. The cam finger 176 extends rearwardly from the deadlocking plate in an angle approximately 45 and has a cam surface on the forward side thereof.

In the operation of the deadlocking mechanism to be hereinafter described, each finger 172 on the deadlocking plate is adapted to enter an associated slot 180 formed in the case 18 in general lateral alignment with the forward end of the ramp 1711when the tailpiece 152 is in its normal position, as it appears in FIG. 1. The rear edges of the latter slots provide abutments 182, 182, best shown in FIG. 8, which are engaged by the fingers 172, 172 to prevent depression of the latch bolt to its fully retracted position. i

In operation, when the door in which the latch set 10 is mounted is open, the latch'unit 14 is in its normal condition, as it appears in FIG. 1. When the door is closed, the beveled surface of the latch bolt will engage a strike 138 to urge the latch bolt to its retracted position. The deadlocking plate 171 and the auxiliary bolt 142 are carried rearwardly with the latch bolt in the same relative positions which they normally occupy when the door is open. The latch bolt and the parts car ried thereby move rearwardly independently of the tailpiece 152 against the force of springs 1511 and 146 until the deadlocking plate 171 engages the forward end of the ramp 170 whereupon the tailpiece 152 moves rearwardly with the latch bolt 21). During this movement, the deadlocking plate is held in its retracted or nondeadlocking position by the blocking surface 144 on the auxiliary bolt 142. When the door is fully closed, the latch bolt 21) is projected into an opening in the strike 138 by the spring 1 16. The tailpiece 152 is also simultaneously urged to the position shown in FIG. 7 with the latch bolt under the influence of the springs 164 and 146. However, auxiliary bolt 142 is retained in depressed position by engagement of its outer end with the strike plate 138, as shown in FIG. 7. It will be noted that when the auxiliary bolt is depressed, the deadlocking plate 171 is no longer held out of its deadlocking position by the blocking abutment 144 thereon, but rather by engagement of the cam finger 176 with an adjaeent side of the tailpiece 152 forwardly of the cam re cess 168.

When the operating unit 12 is actuated to open the door, the tailpiece 152 is drawn rearwardly by the retractor slide 44 to withdraw the latch bolt 20 from the strike-plate 138 and retract it into the latch case 18. During retraction of the latch bolt by the operating unit 12, the latch bolt 20 and the tailpiece 152 move rearwardly as a unit in the same relative positions as illustrated in FIG. 1, thedeadlocking plate 171 being retained in non-deadlocking position during the rearward movement of the latter parts. When the door is opened, the spring urges the auxiliary bolt 142 to its normal or projected position relative to the latch bolt to bring the blocking abutment 144 thereon into blocking relation with the deadlocking plate whereby the latter plate is maintained in its released position by the auxiliary bolt as the latch mechanism returns to its normal position under the combined influence of the springs 146, 150 and 164. 1f, while the door is closed and the latch mechanism is in the condition illustrated in FIG. 7, an attempt is made to forcibly depress the latch bolt 20 as by insertion of a tool, such as indicated at 184 (FIG. 8), between the outer edge of the door and the strike plate 138, the latch bolt 20 and the deadlocking plate 171 carried thereby will move rearwardly relative to the tailpiece 152 which is maintained in its normalposition by the spring 164. As the latch lbolt 20 moves rearwardly, the inclined forward edge of the ramp is engaged by an associated side edge of the opening 174 in the deadlocking plate and is positively cammed laterally outwardly with respect to the latch bolt to project the fingers 172, 172 into the slots 180, in the case. The fingers 172, 172 respectively, engage the abutments 182, 182 to prevent further rearward movement of depression of the latch bolt. When the tool 184 is removed, the spring 146 urges the latch bolt toward its normal projected position. As the latch bolt 20 and the deadlocking plate 171 move forwardly relative to the tailpiece 152, the cam surface 178 on the cam finger 1'76 engages the forward edge of the cam recess 168 to positively drive the deadlocking plate to its released position.

As previously noted, the lock set of the present invention may be provided in a variety of functions. It may, for example, be provided with a privacy function which incorporates locking means operable only from the interior or inner side of an associated door to prevent operation of the lock set from the exterior side thereof. Such a lock set may, for example, include a locking bar which extends through the housing and is operated by a push button mounted in the inner door knob. When the push button is depressed, the locking bar moves to a locking position, as previously described, to prevent relative rotation between the exterior rollback in the housing of the operating unit. Since the exterior rollback cannot be rotated by operation of the exterior door knob when the locking bar is in its locked position, the lock set cannot be operated from the exterior side of the door to retract the latch bolt. However, when the present lock set is provided with a privacy function of the aforedescribed general type, it is essential that means also be provided to release or unlock the locking mechanism each time the latch bolt moves to its retracted or depressed position to prevent lock outs. A lock set having such a privacy function is illustrated and described in US. Pat. No. 3,128,112 to Fryer entitled Privacy Lock Set, Issued Apr. 7, 1964 and assigned to the assignee of the present application. The aforesaid US. patent includes disclosure of a modified form of the locking bar structure hereinbefore described wherein the locking bar thereof is automatically released from its locked position upon retraction of the latch bolt for any reason and reference may be had to the aforecited patent for a detailed description of the aforesaid privacy function and its associated structure.

In order to adapt the previously described lock set to the aforesaid privacy function, positive driving connection must be provided between the latch bolt and retractor slide so that the latch bolt moves in response to operation of the retractor slide and the retractor slide also moves in response to depression or retraction of the latch bolt, as for example, retraction caused by engagement of the latch bolt with an associated strike as in closing a door. Referring now to FIG. 11, a lock set embodying the present invention and provided with the aforesaid positive driving connection between a latch unit and operating unit is indicated generally by the ref erence numeral 100. The lock set a includes an operating unit 12a and a latch bolt unit 14a. The latch unit is provided with a female connecting member 152a which includes a pair of spaced apart legs 160a and 1600 as previously described. However, it will be noted that each leg has two longitudinally spaced and transversely inwardly extending lugs 162a, 162a on the rear or exposed end portion thereof. The head 76a on the retractor slide is received between the lugs 162a and 162a, whereby positive drive connection is established between the operating unit 12a and the latch bolt unit 14a.

We claim:

1. A cylindrical lock set comprising an operating unit having a cylindrical housing, a unitary retractor frame supported in a fixed position in said housing and having spaced parallel laterally inwardly facing slide surfaces thereon, a unitary retractor slide supported by said frame for longitudinal sliding movement relative thereto between projected and retracted positions and having laterally outwardly facing bearing surfaces on opposite sides thereof, each of said bearing surfaces engaging an associated one of said slide surfaces, said slide having a laterally disposed cam face thereon extending laterally inwardly beyond an associated one of said slide surfaces, and a rollback rotatably supported on said housing for moving said slide to its retracted position and having a generally rotationally facing cam surface thereon, said cam surface being engagable with said cam face along a continuous line of contact extending both laterally inwardly and laterally outwardly beyond said associated slide surface, and a latch bolt unit including a case releasably secured to said housing, a latch bolt supported in said case for longitudinal movement between projected and retracted positions relative thereto, and means releasably connecting said latch bolt to said slide for movement therewith in response to operation of said rollback.

2. A cylindrical lock set as set forth in claim 1 wherein said unitary retractor frame comprises a nonmetallic low friction material.

3. A cylindrical lock set as set forth in claim 1 wherein said unitary retractor frame comprises one ma terial and said unitary retractor slide comprises another material.

4. A cylindrical lock set as set forth in claim 1 wherein said slide has a male connecting portion and said means for releasably connecting said latch bolt comprises a female connecting member attached to said latch bolt and extending longitudinally rearwardly therefrom, said female connecting member having a substantially uniform lateral thickness throughout its length and receiving and engaging said male connecting portion.

5. A cylindrical lock set as set forth in claim 4 wherein said male connecting portion comprises a longitudinally forwardly projecting stem on said slide having an enlarged head on the forward end thereof and said female connecting member comprises a tailpiece and includes a generally U-shaped rearwardly opening female connecting portion defined by parallel spaced rearwardly extending legs receiving said head therebetween, each of said legs having at least one transversely inwardly projecting lug thereon engaging said head rearwardly thereof, said lateral thickness being substantially less than the lateral width of said head.

6. A cylindrical lock set as set forth in claim 1 further characterized by said housing including an outer end wall having an outer sleeve secured thereto and extending outwardly therefrom, said outer sleeve having a slot therein communicating with a slot in said outer end wall, said rollback comprising a tubular outer rollback rotatably supported in said outer sleeve, said combination further including a tubular inner rollback rotatably supported on said housing and extending from the inner end thereof for moving said retractor slide to its retracted position, and a locking bar assembly including a locking bar having a locking dog mounted on one end portion thereof, said locking bar supported in said inner rollback and extending therethrough into said housing and having said one end portion disposed in said outer sleeve and said locking dog disposed in said slot therein, said locking bar being axially movable relative to said inner and outer rollbacks between a locking position wherein said locking dog engages said outer rollback to prevent rotation thereof relative to said outer sleeve and a release position wherein said outer rollback is free to rotate relative to said outer sleeve, said locking dog during assembly passing through said slot in said housing outer wall to enter said slot in said outer sleeve, said retractor frame having an outer end wall engaging said housing outer end wall in assembly and overlying at least a portion of said slot in said housing outer end wall to prevent said locking dog from passing through the latter slot.

7. A cylindrical lock set as set forth in claim 6 wherein said locking dog in said release position is disposed in said slot in said housing outer end wall and in engagement with said frame outer end wall.

8. A cylindrical lock set as set forth in claim 1 wherein said generally cylindrical housing includes an annular wall, said unitary retractor frame has a generally U-shaped forwardly opening slideway formed therein and partially defined by a generally arcuate rear wall portion for complementary engagement with an associated portion of said annular wall, said rear wall portion has a spring retaining recess therein, said unitary retractor slide is slidably received in said slideway through the forward end thereof and retained therein by assembly of said retractor frame with said housing, and a retractor spring has one end thereof received in said retaining recess and the other end thereof engaging said slide for biasing said retractor slide toward said forward end.

9. The combination as set forth in claim 8 wherein said retaining recess opens through said rear wall portion to permit said retractor spring to pass therethrough, said retractor spring being retained in assembly with said retractor slide by assembly of said retractor frame with said housing, said one end bearing against said annular wall.

10. A cylindrical lock set comprising an operating unit having a cylindrical housing including inner and outer end walls, inner and outer sleeves respectively secured to and extending outwardly from said inner and outer end walls, a unitary retractor frame supported in fixed position in said housing and havingspaced parallel laterally inwardly facing slide surfaces thereon, a unitary retractor slide supported in said frame for longitudinal sliding movement relative thereto between projected and retracted positions and having laterally outwardly facing bearing surfaces on opposite sides thereof, each of said bearing surfaces engaging an associated one of said slide surfaces, said slide having laterally disposed carn faces on opposite sides thereof, each of said cam faces extending both laterally inwardly and laterally outwardly beyond an associated one of said slide surfaces, inner and outer tubular rollbacks respectively rotatably supported in said inner and outer sleeves, each of said rollbacks having generally rotationally facing cam surfaces on the inner end thereof, each of said cam surfaces being engagable with an asso ciated one of said cam faces laterally inwardly and laterally outwardly of an associated one of said slidesurfaces, and latch bolt unit including a case releasably secured to said housing, a latch bolt supported in said case for longitudinal movement between projected and retracted positions relative thereto, and means for releasably connecting said latch bolt to said slide for movement therewith inresponse to operation of either of said rollbacks.

11. A cylindrical lock set as set forth in claim 10 wherein said retractor frame is made from non-metallic low friction material and said retractor slide is made from metal.

12. A cylindrical lock set as set forth in claim 10 wherein said inner end wall comprises a removable cover and said combination includes means for releasably securing said cover to the remainder of said housmg.

13. A latch bolt operating unit having a housing, a unitary retractor frame supported in fixed position in said housing and having spaced parallel laterally inwardly facing slide surfaces thereon, a unitary retractor slide supported by said frame for longitudinal sliding movement relative thereto between projected and re tracted positions and having laterally outwardly facing bearing surfaces on opposite sides thereof, each of said bearing surfaces engaging an associated one of said slide surfaces, said slide having a laterally disposed cam face thereon extending both laterally inwardly and laterally outwardly beyond an associated one of said slide surfaces, and a rollback rotatably supported on said housing for moving said slide to its retracted position and having a generally rotationally facing cam surface thereon engagable with said cam face both laterally inwardly and laterally outwardly beyond said associated slide surface.

14. A latch bolt operating unit as set forth in claim 13 wherein said retractor frame includes a slideway comprising spaced parallel inwardly facing tracks defining said slide surfaces and said. retractor slide has a generally l-shaped cross-section and includes a pair of slide shoes connected by a relatively thin integral longitudinally extending central web, each of said shoes received in and complementing an associated one of said tracks, said shoes defining said bearing surfaces, said cam surface engaging said cam face near said central web.

15..A latch bolt unit comprisinga case, a latch bolt supported in said case for longitudinal movement between projected and retracted positions relative thereto, and a unitary tailpiece attached to said latch bolt and longitudinally rearwardly extending therefrom, said tailpiece including a generally U-shaped rearwardly opening female connecting portion defined by parallel spaced legs projecting rearwardly from said case, each of said legs having a pair of longitudinally spaced apart transversely inwardly projecting lugs thereon transversely aligned with said lugs on the other of said legs.

16. A latch bolt unit as set forth in claim 15 wherein said unitary tailpiece has a substantially uniform thickness throughout its length.

17. A latch bolt unit comprising a case, a latch bolt supported in said case for longitudinal movement be tween. projected and retracted positions relative thereto, a unitary tailpiece attached to said latch bolt and longitudinally rearwardly extending therefrom, said tailpiece having a cam thereon and including a generally U-shaped rearwardly opening female connecting portion defined by parallel spaced legs projecting rearwardly from said case, each of said legs having at least one transversely inwardly projecting lug thereon transversely aligned with said lug on the other of said legs, means providing lost motion connection between said tailpiece and said latch bolt permitting depression of said latch bolt from its projected position independently of said tailpiece, an abutment on said case, a deadlocking member mounted on said latch bolt for movement transversely of said tailpiece between a nondeadlocking position clear of said abutment and a deadlocking position engaged with said abutment wherein depression of said latch bolt from its projected to its retracted position is prevented, means for retaining said deadlocking member in non-deadlocking posi tion when said latch bolt is in its projected position, said cam positively driving said deadlocking member to its deadlocking position in response to the initial movement of said latch bolt when it is depressed from its projected position independently of said tailpiece.

18. A latch bolt unit as set forth in claim 17 wherein said tailpiece includes a blocking portion alignable with said deadlocking member in its deadlocking position for preventing movement of said deadlocking member out of said deadlocking position.

19. A latch bolt unit as set forth in claim 17 including means for biasing said latch bolt toward its projected position and means for positively driving said deadlocking member from its deadlocking position to its nondeadlocking position when said biasing means moves said latch bolt from its depressed to its projected position independently of said tail piece.

20. A latch bolt unit as set forth in claim 17 wherein said deadlocking member has a projection thereon and said tailpiece has a recess therein normally disposed rearwardly of said projection and receiving said projection therein when said deadlocking member is in its deadlocking position, said projection and an associated edgeof said recess defining coengaging cam surfaces comprising means for positively driving said deadlocking member from its deadlocking to its nondeadlocking position.

21. A latch bolt unit as set forth in claim 20 wherein said recess is formed in one side of said tailpiece and said means for positively driving said deadlocking member to its deadlocking position comprises a cam projection on the other side of said tailpiece laterally opposite said recess having a cam surface thereon for engaging an associated cam surface on said deadlocking member.

22. A latch bolt unit as set forth in claim 20 wherein said projection cooperates with an associated side portion of said tailpiece forwardly of said recess to provide said means for retaining said deadlocking member in its non-deadlocking position when said latch bolt is in its projected position.

23. A cylindrical lock set comprising an operating unit having a cylindrical housing, a unitary retractor frame supported in fixed position in said housing and having a slideway including spaced parallel inwardly facing tracks having spaced parallel laterally inwardly facing slide surfaces thereon, a unitary retractor slide supported by said frame for longitudinal sliding movement relative thereto between projected and retracted positions and having a generally I-shaped cross-section including a pair of slide shoes connected by a relatively thin integral longitudinal extending web, each of said shoes being received in an associated one of said tracks and having laterally outwardly facing bearing surfaces on opposite sides thereof, each of said bearing surfaces engaging an associated one of said slide surfaces, said slide having a laterally disposed cam face thereon extending laterally inwardly beyond an associated one of said slide surfaces, and a rollback rotatably supported on said housing for moving said slide to its retracted position and having a generally rotationally facing cam surface thereon for engaging said cam face laterally inwardly of said associated slide surface and near said central web, and a latch bolt unit including a case releasably secured to said housing, a latch bolt supported in said case for longitudinal movement between projected and retracted positions relative thereto, and means releasably connecting said latch bolt to said slide for movement therewith in response to operation of said rollback.

24. A cylindrical lock set comprising an operating unit having a cylindrical housing, a unitary retractor frame supported in fixed position in said housing, a unitary retractor slide supported by said frame for longitudinal sliding movement relative thereto between projected and retracted positions and having a longitudinally forwardly projecting stem including an enlarged head on the forward end thereof, a rollback rotatably supported on said housing for moving said slide to its retracted position, and a latch bolt unit including a case releasably secured to said housing, a latch bolt supported in said case for longitudinal movement between projected and retracted positions relative thereto, and a tailpiece attached to said latch bolt and longitudinally rearwardly extending therefrom and having a substantially uniform lateral thickness throughout its length, said lateral thickness being substantially less than the lateral width of said head, said tailpiece including a generally U-shaped rearwardly opening female connecting portion defined by parallel spaced rearwardly extending legs receiving said head therebetween each of said legs having at least one transversely inwardly projecting lug thereon engaging said head rearwardly thereof.

25. A cylindrical lock set as set forth in claim 24 wherein each of said legs has another transversely inwardly projecting lug thereon longitudinally spaced from said one lug, said one lug and said other lug receiving said head therebetween.

26. A latch bolt operating unit having a cylindrical housing, a unitary retractor frame supported in fixed position in said housing and having a slideway including spaced parallel inwardly facing tracks having spaced parallel laterally inwardly facing slide surfaces thereon, a unitary retractor slide supported by said frame for longitudinal sliding movement relative thereto between projected and retracted positions and having a generally, I-shaped cross-section including a pair of slide shoes connected by a thin integral longitudinally extending web, each of said shoes being received in an associated one of said tracks and having laterally outwardly facing bearing surfaces on opposite sides thereof, each of said bearing surfaces engaging an associated one of said slide surfaces, said slide having a laterally disposed cam face thereon extending laterally inwardly beyond an associated one of said slide surfaces, and a rollback rotatably supported on said housing for moving said slide to its retracted position and having a generally rotationally facing cam surface thereon for engaging said cam face laterally inwardly of said associated slide surface and near said central web.

27. A cylindrical lock set comprising an operating unit having a cylindrical housing, a unitary retractor frame supported in fixed position in said housing and having spaced parallel laterally inwardly facing slide surfaces thereon, a unitary retractor slide supported by said frame for longitudinal sliding movement relative thereto between projected and retracted positions and having laterally outwardly facing bearing surfaces on opposite sides thereof, each of said bearing surfaces engaging an associated one of said slide surfaces, said slide having a laterally disposed cam face thereon extending laterally inwardly beyond an associated one of said slide surfaces, and a rollback rotatably supported on said housing for moving said slide to its retracted position and having a generally rotationally facing cam surface thereon engaging said cam face laterally inwardly of said associated slide surface, and a latch bolt unit including a case releasably secured to said housing, a latch bolt supported in said case for longitudinal movement between projected and retracted positions relative thereto, a unitary tailpiece connected to said latch bolt and longitudinally rearwardly extending therefrom, said tailpiece having a cam thereon and a substantially uniform thickness throughout its length, means providing lost motion connection between said tailpiece and said latch bolt permitting depression of said latch bolt from its projected position independently of said tailpiece, an abutment on said case, a

deadlocking member mounted on said latch bolt for deadlocking position clear of said abutment and a deadlocking position engaged with said abutment wherein depression of said latch bolt from its projected to its retracted position is prevented, and means for retaining said deadlocking member in non-deadlocking position when said latch bolt is in its projected position, said cam positively driving said deadlocking member to its deadlocking position in response to the initial movement of said latch bolt when it is depressed from its projected position independently of said tailpiece.

28. A cylindrical lock set as set forth in claim 27 wherein said tailpiece includes a blocking portion alignable with said deadlocking member in its deadlocking position for preventing movement of said deadlocking member out of said deadlocking position.

29. A cylindrical lock set as set forth in claim 27 including means for biasing said latch bolt toward its projected position and means for positively driving said deadlocking member from its deadlocking position to its non-deadlocking position when said biasing means moves said latch bolt from its depressed to its projected position independently of said tailpiece.

30. A cylindrical lock set as set forth in claim 29 wherein said deadlocking member has a projection thereon and said tailpiece has a recess therein normally disposed rearwardly of said projection and receiving said projection therein when said deadlocking member is in its deadlocking position, said projection and an associated edge of said recess defining coengaging cam surfaces comprising said means for positively driving said deadlocking member from its deadlocking to its non-deadlocking position.

31. A cylindrical lock set as set forth in claim 30 wherein said projection cooperates with an associated side portion of said tailpiece forwardly of said recess to provide said means for retaining said deadlocking member in its non-deadlocking position when said latch bolt is in its projected position.

32. A cylindrical lock set as set forth in claim 30 wherein said recess is formed in one side of said tailpiece and said cam projects from the other side of said tailpiece laterally opposite said recess.

33. A cylindrical lock set comprising an operating unit having a cylindrical housing. a unitary retractor frame supported in fixed position in said housing and having spaced parallel laterally inwardly facing slide surfaces thereon, a unitary retractor slide supported by said frame for longitudinal sliding movement relative thereto between projected and retracted positions and having laterally-outwardly facing bearing surfaces on opposite sides thereof, each of said bearing surfaces engaging an associated one of said slide surfaces, said slide having a laterally disposed cam face thereon extending laterally inwardly beyond an associated one of said slide surfaces and a male connecting portion including a longitudinally forwardly projecting stem having an enlarged head on the forward end thereof, and a rollback rotatably supported on said housing for moving said slideto its retracted position and having a generally rotationally facing cam surface thereon engaging said cam face laterally inwardly of said associated slide surface, and a latch bolt unit including a case releasably secured to said housing, a latch bolt supported in said case for longitudinal movement between projected and retracted positions relative thereto, and a tailpiece releasably connecting said latch bolt to said slide for movement therewith in response to operation of said rollback, said tailpiece being attached to said latch bolt and longitudinally rearwardly extending therefrom and including a generally U-shaped rearwardly opening female connecting portion defined by parallel spaced rearwardly extending legs receiving said head therebetween, each of said legs having one transversely inwardly projecting lug thereon engaging said head rearwardly thereof and another transversely inwardly projecting lug thereon longitudinally spaced from said one lug, said other lug engaging said head forwardly thereof.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No ,214 I Dated June 25, 1974 lnventofls) LeRoy Hart Thomas R. Salonia and Gary R. Bergen It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

C01. 1, line 65, "dead-locking" should read -deadlocking--.

Col. 3, line 41, after "surfaces" insert --,72, 72 in respective sliding engagement with slide surfaces--.

Col. 4, line 45, after "mechanism" delete "of" and substitute --by--.

Col. 11, line LIZ delete "a".

C01. 13, line 37, after "and" insert --a--. I

Signed and sealed this 20th day of May 1975.

(SEAL) Attest C.' MARSHALL DANN I RUTH C. MASON Commissioner of Patents Attesting Officer and Trademarks 'ORM Po-1oso (10-69) uscoMM-oc 60376-P69 i U. 57 GOVERNMENT PRINTING OFFiICE I9? 0-356-534, 

1. A cylindrical lock set comprising an operating unit having a cylindrical housing, a unitary retractor frame supported in a fixed position in said housing and having spaced parallel laterally inwardly facing slide surfaces thereon, a unitary retractor slide supported by said frame for longitudinal sliding movement relative thereto between projected and retracted positions and having laterally outwardly facing bearing surfaces on opposite sides thereof, each of said bearing surfaces engaging an associated one of said slide surfaces, said slide having a laterally disposed cam face thereon extending laterally inwardly beyond an associated one of said slide surfaces, and a rollback rotatably supported on said housing for moving said slide to its retracted position and having a generally rotationally facing cam surface thereon, said cam surface being engagable with said cam face along a continuous line of contact extending both laterally inwardly and laterally outwardly beyond said associated slide surface, and a latch bolt unit including a case releasably secured to said housing, a latch bolt supported in said case for longitudinal movement between projected and retracted positions relative thereto, and means releasably connecting said latch bolt to said slide for movement therewith in response to operation of said rollback.
 2. A cylindrical lock set as set forth in claim 1 wherein said unitary retractor frame comprises a non-metallic low friction material.
 3. A cylindrical lock set as set forth in claim 1 wherein said unitary retractor frame comprises one material and said unitary retractor slide comprIses another material.
 4. A cylindrical lock set as set forth in claim 1 wherein said slide has a male connecting portion and said means for releasably connecting said latch bolt comprises a female connecting member attached to said latch bolt and extending longitudinally rearwardly therefrom, said female connecting member having a substantially uniform lateral thickness throughout its length and receiving and engaging said male connecting portion.
 5. A cylindrical lock set as set forth in claim 4 wherein said male connecting portion comprises a longitudinally forwardly projecting stem on said slide having an enlarged head on the forward end thereof and said female connecting member comprises a tailpiece and includes a generally U-shaped rearwardly opening female connecting portion defined by parallel spaced rearwardly extending legs receiving said head therebetween, each of said legs having at least one transversely inwardly projecting lug thereon engaging said head rearwardly thereof, said lateral thickness being substantially less than the lateral width of said head.
 6. A cylindrical lock set as set forth in claim 1 further characterized by said housing including an outer end wall having an outer sleeve secured thereto and extending outwardly therefrom, said outer sleeve having a slot therein communicating with a slot in said outer end wall, said rollback comprising a tubular outer rollback rotatably supported in said outer sleeve, said combination further including a tubular inner rollback rotatably supported on said housing and extending from the inner end thereof for moving said retractor slide to its retracted position, and a locking bar assembly including a locking bar having a locking dog mounted on one end portion thereof, said locking bar supported in said inner rollback and extending therethrough into said housing and having said one end portion disposed in said outer sleeve and said locking dog disposed in said slot therein, said locking bar being axially movable relative to said inner and outer rollbacks between a locking position wherein said locking dog engages said outer rollback to prevent rotation thereof relative to said outer sleeve and a release position wherein said outer rollback is free to rotate relative to said outer sleeve, said locking dog during assembly passing through said slot in said housing outer wall to enter said slot in said outer sleeve, said retractor frame having an outer end wall engaging said housing outer end wall in assembly and overlying at least a portion of said slot in said housing outer end wall to prevent said locking dog from passing through the latter slot.
 7. A cylindrical lock set as set forth in claim 6 wherein said locking dog in said release position is disposed in said slot in said housing outer end wall and in engagement with said frame outer end wall.
 8. A cylindrical lock set as set forth in claim 1 wherein said generally cylindrical housing includes an annular wall, said unitary retractor frame has a generally U-shaped forwardly opening slideway formed therein and partially defined by a generally arcuate rear wall portion for complementary engagement with an associated portion of said annular wall, said rear wall portion has a spring retaining recess therein, said unitary retractor slide is slidably received in said slideway through the forward end thereof and retained therein by assembly of said retractor frame with said housing, and a retractor spring has one end thereof received in said retaining recess and the other end thereof engaging said slide for biasing said retractor slide toward said forward end.
 9. The combination as set forth in claim 8 wherein said retaining recess opens through said rear wall portion to permit said retractor spring to pass therethrough, said retractor spring being retained in assembly with said retractor slide by assembly of said retractor frame with said housing, said one end bearing against said annular wall.
 10. A cylindrical lock set comprising an operating uNit having a cylindrical housing including inner and outer end walls, inner and outer sleeves respectively secured to and extending outwardly from said inner and outer end walls, a unitary retractor frame supported in fixed position in said housing and having spaced parallel laterally inwardly facing slide surfaces thereon, a unitary retractor slide supported in said frame for longitudinal sliding movement relative thereto between projected and retracted positions and having laterally outwardly facing bearing surfaces on opposite sides thereof, each of said bearing surfaces engaging an associated one of said slide surfaces, said slide having laterally disposed cam faces on opposite sides thereof, each of said cam faces extending both laterally inwardly and laterally outwardly beyond an associated one of said slide surfaces, inner and outer tubular rollbacks respectively rotatably supported in said inner and outer sleeves, each of said rollbacks having generally rotationally facing cam surfaces on the inner end thereof, each of said cam surfaces being engagable with an associated one of said cam faces laterally inwardly and laterally outwardly of an associated one of said slide surfaces, and latch bolt unit including a case releasably secured to said housing, a latch bolt supported in said case for longitudinal movement between projected and retracted positions relative thereto, and means for releasably connecting said latch bolt to said slide for movement therewith in response to operation of either of said rollbacks.
 11. A cylindrical lock set as set forth in claim 10 wherein said retractor frame is made from non-metallic low friction material and said retractor slide is made from metal.
 12. A cylindrical lock set as set forth in claim 10 wherein said inner end wall comprises a removable cover and said combination includes means for releasably securing said cover to the remainder of said housing.
 13. A latch bolt operating unit having a housing, a unitary retractor frame supported in fixed position in said housing and having spaced parallel laterally inwardly facing slide surfaces thereon, a unitary retractor slide supported by said frame for longitudinal sliding movement relative thereto between projected and retracted positions and having laterally outwardly facing bearing surfaces on opposite sides thereof, each of said bearing surfaces engaging an associated one of said slide surfaces, said slide having a laterally disposed cam face thereon extending both laterally inwardly and laterally outwardly beyond an associated one of said slide surfaces, and a rollback rotatably supported on said housing for moving said slide to its retracted position and having a generally rotationally facing cam surface thereon engagable with said cam face both laterally inwardly and laterally outwardly beyond said associated slide surface.
 14. A latch bolt operating unit as set forth in claim 13 wherein said retractor frame includes a slideway comprising spaced parallel inwardly facing tracks defining said slide surfaces and said retractor slide has a generally I-shaped cross-section and includes a pair of slide shoes connected by a relatively thin integral longitudinally extending central web, each of said shoes received in and complementing an associated one of said tracks, said shoes defining said bearing surfaces, said cam surface engaging said cam face near said central web.
 15. A latch bolt unit comprising a case, a latch bolt supported in said case for longitudinal movement between projected and retracted positions relative thereto, and a unitary tailpiece attached to said latch bolt and longitudinally rearwardly extending therefrom, said tailpiece including a generally U-shaped rearwardly opening female connecting portion defined by parallel spaced legs projecting rearwardly from said case, each of said legs having a pair of longitudinally spaced apart transversely inwardly projecting lugs thereon transversely aligned with said lugs on the other of said legs.
 16. A latcH bolt unit as set forth in claim 15 wherein said unitary tailpiece has a substantially uniform thickness throughout its length.
 17. A latch bolt unit comprising a case, a latch bolt supported in said case for longitudinal movement between projected and retracted positions relative thereto, a unitary tailpiece attached to said latch bolt and longitudinally rearwardly extending therefrom, said tailpiece having a cam thereon and including a generally U-shaped rearwardly opening female connecting portion defined by parallel spaced legs projecting rearwardly from said case, each of said legs having at least one transversely inwardly projecting lug thereon transversely aligned with said lug on the other of said legs, means providing lost motion connection between said tailpiece and said latch bolt permitting depression of said latch bolt from its projected position independently of said tailpiece, an abutment on said case, a deadlocking member mounted on said latch bolt for movement transversely of said tailpiece between a nondeadlocking position clear of said abutment and a deadlocking position engaged with said abutment wherein depression of said latch bolt from its projected to its retracted position is prevented, means for retaining said deadlocking member in non-deadlocking position when said latch bolt is in its projected position, said cam positively driving said deadlocking member to its deadlocking position in response to the initial movement of said latch bolt when it is depressed from its projected position independently of said tailpiece.
 18. A latch bolt unit as set forth in claim 17 wherein said tailpiece includes a blocking portion alignable with said deadlocking member in its deadlocking position for preventing movement of said deadlocking member out of said deadlocking position.
 19. A latch bolt unit as set forth in claim 17 including means for biasing said latch bolt toward its projected position and means for positively driving said deadlocking member from its deadlocking position to its non-deadlocking position when said biasing means moves said latch bolt from its depressed to its projected position independently of said tail piece.
 20. A latch bolt unit as set forth in claim 17 wherein said deadlocking member has a projection thereon and said tailpiece has a recess therein normally disposed rearwardly of said projection and receiving said projection therein when said deadlocking member is in its deadlocking position, said projection and an associated edge of said recess defining coengaging cam surfaces comprising means for positively driving said deadlocking member from its deadlocking to its non-deadlocking position.
 21. A latch bolt unit as set forth in claim 20 wherein said recess is formed in one side of said tailpiece and said means for positively driving said deadlocking member to its deadlocking position comprises a cam projection on the other side of said tailpiece laterally opposite said recess having a cam surface thereon for engaging an associated cam surface on said deadlocking member.
 22. A latch bolt unit as set forth in claim 20 wherein said projection cooperates with an associated side portion of said tailpiece forwardly of said recess to provide said means for retaining said deadlocking member in its non-deadlocking position when said latch bolt is in its projected position.
 23. A cylindrical lock set comprising an operating unit having a cylindrical housing, a unitary retractor frame supported in fixed position in said housing and having a slideway including spaced parallel inwardly facing tracks having spaced parallel laterally inwardly facing slide surfaces thereon, a unitary retractor slide supported by said frame for longitudinal sliding movement relative thereto between projected and retracted positions and having a generally I-shaped cross-section including a pair of slide shoes connected by a relatively thin integral longitudinal extending web, each of said shoes being received in an associated one of said tracks and havinG laterally outwardly facing bearing surfaces on opposite sides thereof, each of said bearing surfaces engaging an associated one of said slide surfaces, said slide having a laterally disposed cam face thereon extending laterally inwardly beyond an associated one of said slide surfaces, and a rollback rotatably supported on said housing for moving said slide to its retracted position and having a generally rotationally facing cam surface thereon for engaging said cam face laterally inwardly of said associated slide surface and near said central web, and a latch bolt unit including a case releasably secured to said housing, a latch bolt supported in said case for longitudinal movement between projected and retracted positions relative thereto, and means releasably connecting said latch bolt to said slide for movement therewith in response to operation of said rollback.
 24. A cylindrical lock set comprising an operating unit having a cylindrical housing, a unitary retractor frame supported in fixed position in said housing, a unitary retractor slide supported by said frame for longitudinal sliding movement relative thereto between projected and retracted positions and having a longitudinally forwardly projecting stem including an enlarged head on the forward end thereof, a rollback rotatably supported on said housing for moving said slide to its retracted position, and a latch bolt unit including a case releasably secured to said housing, a latch bolt supported in said case for longitudinal movement between projected and retracted positions relative thereto, and a tailpiece attached to said latch bolt and longitudinally rearwardly extending therefrom and having a substantially uniform lateral thickness throughout its length, said lateral thickness being substantially less than the lateral width of said head, said tailpiece including a generally U-shaped rearwardly opening female connecting portion defined by parallel spaced rearwardly extending legs receiving said head therebetween each of said legs having at least one transversely inwardly projecting lug thereon engaging said head rearwardly thereof.
 25. A cylindrical lock set as set forth in claim 24 wherein each of said legs has another transversely inwardly projecting lug thereon longitudinally spaced from said one lug, said one lug and said other lug receiving said head therebetween.
 26. A latch bolt operating unit having a cylindrical housing, a unitary retractor frame supported in fixed position in said housing and having a slideway including spaced parallel inwardly facing tracks having spaced parallel laterally inwardly facing slide surfaces thereon, a unitary retractor slide supported by said frame for longitudinal sliding movement relative thereto between projected and retracted positions and having a generally, I-shaped cross-section including a pair of slide shoes connected by a thin integral longitudinally extending web, each of said shoes being received in an associated one of said tracks and having laterally outwardly facing bearing surfaces on opposite sides thereof, each of said bearing surfaces engaging an associated one of said slide surfaces, said slide having a laterally disposed cam face thereon extending laterally inwardly beyond an associated one of said slide surfaces, and a rollback rotatably supported on said housing for moving said slide to its retracted position and having a generally rotationally facing cam surface thereon for engaging said cam face laterally inwardly of said associated slide surface and near said central web.
 27. A cylindrical lock set comprising an operating unit having a cylindrical housing, a unitary retractor frame supported in fixed position in said housing and having spaced parallel laterally inwardly facing slide surfaces thereon, a unitary retractor slide supported by said frame for longitudinal sliding movement relative thereto between projected and retracted positions and having laterally outwardly facing bearing surfaces on opposite sides thereof, each of saiD bearing surfaces engaging an associated one of said slide surfaces, said slide having a laterally disposed cam face thereon extending laterally inwardly beyond an associated one of said slide surfaces, and a rollback rotatably supported on said housing for moving said slide to its retracted position and having a generally rotationally facing cam surface thereon engaging said cam face laterally inwardly of said associated slide surface, and a latch bolt unit including a case releasably secured to said housing, a latch bolt supported in said case for longitudinal movement between projected and retracted positions relative thereto, a unitary tailpiece connected to said latch bolt and longitudinally rearwardly extending therefrom, said tailpiece having a cam thereon and a substantially uniform thickness throughout its length, means providing lost motion connection between said tailpiece and said latch bolt permitting depression of said latch bolt from its projected position independently of said tailpiece, an abutment on said case, a deadlocking member mounted on said latch bolt for movement transversely of said tailpiece between a non-deadlocking position clear of said abutment and a deadlocking position engaged with said abutment wherein depression of said latch bolt from its projected to its retracted position is prevented, and means for retaining said deadlocking member in non-deadlocking position when said latch bolt is in its projected position, said cam positively driving said deadlocking member to its deadlocking position in response to the initial movement of said latch bolt when it is depressed from its projected position independently of said tailpiece.
 28. A cylindrical lock set as set forth in claim 27 wherein said tailpiece includes a blocking portion alignable with said deadlocking member in its deadlocking position for preventing movement of said deadlocking member out of said deadlocking position.
 29. A cylindrical lock set as set forth in claim 27 including means for biasing said latch bolt toward its projected position and means for positively driving said deadlocking member from its deadlocking position to its non-deadlocking position when said biasing means moves said latch bolt from its depressed to its projected position independently of said tailpiece.
 30. A cylindrical lock set as set forth in claim 29 wherein said deadlocking member has a projection thereon and said tailpiece has a recess therein normally disposed rearwardly of said projection and receiving said projection therein when said deadlocking member is in its deadlocking position, said projection and an associated edge of said recess defining coengaging cam surfaces comprising said means for positively driving said deadlocking member from its deadlocking to its non-deadlocking position.
 31. A cylindrical lock set as set forth in claim 30 wherein said projection cooperates with an associated side portion of said tailpiece forwardly of said recess to provide said means for retaining said deadlocking member in its non-deadlocking position when said latch bolt is in its projected position.
 32. A cylindrical lock set as set forth in claim 30 wherein said recess is formed in one side of said tailpiece and said cam projects from the other side of said tailpiece laterally opposite said recess.
 33. A cylindrical lock set comprising an operating unit having a cylindrical housing, a unitary retractor frame supported in fixed position in said housing and having spaced parallel laterally inwardly facing slide surfaces thereon, a unitary retractor slide supported by said frame for longitudinal sliding movement relative thereto between projected and retracted positions and having laterally outwardly facing bearing surfaces on opposite sides thereof, each of said bearing surfaces engaging an associated one of said slide surfaces, said slide having a laterally disposed cam face thereon extending laterally inwardly beyond an associated one of said slide surfaces and a male connecting portion includIng a longitudinally forwardly projecting stem having an enlarged head on the forward end thereof, and a rollback rotatably supported on said housing for moving said slide to its retracted position and having a generally rotationally facing cam surface thereon engaging said cam face laterally inwardly of said associated slide surface, and a latch bolt unit including a case releasably secured to said housing, a latch bolt supported in said case for longitudinal movement between projected and retracted positions relative thereto, and a tailpiece releasably connecting said latch bolt to said slide for movement therewith in response to operation of said rollback, said tailpiece being attached to said latch bolt and longitudinally rearwardly extending therefrom and including a generally U-shaped rearwardly opening female connecting portion defined by parallel spaced rearwardly extending legs receiving said head therebetween, each of said legs having one transversely inwardly projecting lug thereon engaging said head rearwardly thereof and another transversely inwardly projecting lug thereon longitudinally spaced from said one lug, said other lug engaging said head forwardly thereof. 